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TX sticks when I key up
I'm not familiar with the relay in the Cobra 29. Is the relay an "open frame" relay? That means there's no cover over the relay. If it is then it's possible the relay armature is dirty causing the relay to 'stick'. Changing microphones will not cure the problem. If the relay is an open frame...- falcon2448
- Post #3
- Forum: CB and Export Equipment and Accessories
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old tube radio, hum in tx/rx, already recapped
Not likely. V13 operates in Class B Push-Pull and cathode to grid #1 leakage typically cancels out in Push-Pull amplifiers. Looking at V13 you will notice there are 2 sections, pins 6, 7, and 8 which we will refer to as section "A" and pins 1, 2, and 3 which we will refer to as section "B"...- falcon2448
- Post #17
- Forum: CB and Export Equipment and Accessories
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old tube radio, hum in tx/rx, already recapped
Your problem sounds like filament to cathode leakage in one of the common receive and transmit audio tubes. The tube I suspect is V12, 12AT7. V12A is used in the receiver as the first audio amplifier stage. In transmit V12A is used as the microphone amplifier. If hum is produced in V12...- falcon2448
- Post #12
- Forum: CB and Export Equipment and Accessories